New P1/PD Pump Torque Limiter From Parker
“The torque limiter adjusts flow in the circuit to keep the prime mover from stalling under heavy loads,” said Peter Medins, marketing product manager, Parker Hannifin Corporation, Hydraulic Pump Division. “A good analogy is downshifting a heavy truck that's climbing a long grade. The engine puts out the same horsepower, but the truck simply goes slower as the grade increases.”
“The benefit in a hydraulic system is that you can reduce the maximum horsepower available and still handle the same load without stalling. This capability is very significant in the mobile and industrial applications our compact P1/PD pumps are designed for.”
To accomplish this, the torque limiter control monitors both pressure and displacement as measured by the pump's hanger angle. It is a single spring unit that works with the Parker compensator, a ventable pressure limiter or a load sensing or remote venting circuit.
As pressure rises, flow is reduced according to the zero adjustment spring rate of the torque limiter. When pressure has risen to its full value, the compensator assumes control. The torque limiter normally functions down to 20% of corner horsepower, but lower adjustments are possible at the expense of peak pressure.
Parker P1/PD series medium pressure (280 bar/4060 psi), variable displacement, axial piston pumps are design-optimized for open circuit mobile equipment (P1) and industrial applications (PD). The pumps – rated for continuous operation at 2600 rpm – feature a compact, round housing that is both smaller and quieter than conventional pumps with comparable capabilities. Standard options include a full power through drive, a choice of SAE and ISO mounting flanges and ports, end or side inlet and outlet ports, and case drain ports for horizontal, vertical or shaft-up mounting.
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